Phase Diagram of the PbCl₂–ZnCl₂ Binary System and Density of the Binary Melt

Abstract

The phase diagram of PbCl₂–ZnCl₂ binary system has been determined by thermal, chemical and X-ray analyses, and the results obtained are compared with the previously reported ones. It is observed that this system has an eutectic at 23 mol% PbCl₂ and 286°C and shows an inflection in the liquidus in the composition range of 40∼50 mol% PbCl₂.
The density measurement has been made for the binary melts by the Archimedean method with two platinum sinkers of different sizes. The density at each composition decreases almost linearly with rising temperature. The molar volume and the thermal expansion coefficient are calculated from the data obtained. It is noticed that the composition dependence of the temperature coefficient of density and thermal expansion coefficient show inflections at about 50 mol% PbCl₂.